Crafted with natural copper. Prepared with 319612719849 Perform Yourself sequence number. It is suitable for 13 and 17 cm wrist circumference . It is adjustable. Color protection is available. It is sent in a special gift box. With healing. Regarding healing with numbers, Grigori Grabovoi's numbers are among the most used methods today. "Mathematics is the alphabet God uses to write the universe," said Grabovoi, a Russian mathematics professor. a healing method that includes numbers, frequencies and vibrations.